Process of electric welding



(No Model.)

0. L. OOFFIN.

P30035150? ELECTRIC WELDING. No. 405,345. Patented June18, 1889.

i w wvbneeses Inventor W 68. a/Wa K7 54 UNITED STATES PATENT OFFICE.

CHARLES L. COFFIN, OF DETROIT,-MICHIGAN.

PROCESS OF ELECTRIC WELDING.

SPECIFICATION forming part of Letters Patent No. 405,345, dated June 18,1889.

Application filed December 20, 1838. fierial No. 294,194. (No model.)

To all whom, it may concern:

Be it known that I, CHARLES L. COFFIN, of Detroit, in the county of\Vayne and State of Michigan, have invented a new and useful Improvementin Electric Welding, of which the following is a specification.

My invention consists in an improvement in the art of electric welding,hereinafter fully described and claimed.

The drawings are a side elevation, in which Figures 1, 2, 3, andi'illustrate my improvement as applied to the process described inPatent No. 363,320, to De Benardos and Olszewski,'dated May 17, 1887-.Figs. 3, 3 and 5 illustrate my invention as applied to my Letters Patentdated January 15, 1889, No. 396,270.

In all the figures the letter G indicates the articles to be welded, andthe letters BB indicate carbons. The letter C indicates thecarbon-holder, and the letter D. indicates the handle of thecarbon-holder.

In Fig. 1 the carbon B has a central bore, and carries on its upper enda hopper A, containing fine filings or turnings E, of metal, preferablyof the metal to be welded, which pass down through the carbon and fallthrough the are upon the joint, becoming fused and re-enforcing thejoint.

In Fig. 2 the carbon B is also. hollow, and instead of the hopper A andthe filings E a wire or rod F of the proper metal passes down throughthe hollow carbon.

In Fig. 3 the carbon is solid, and a funnel J, carried on thecarbon-holder C, delivers filings or turnings in the are between thecarbon and the article to be welded.

In Figs. 3 and 3 two carbons are used, set at an angle to spring the arcoutward, and the funnel J extends down between the carbons.

In Figs. 4 and 5 a spool L, carried on an arm K, attached to thecarbon-holder C, carries a wire or ribbon of the re-enforcing material,which is fed, as the holder is moved, between the end of the carbon orcarbons and the joint to be welded.

In all the devices illustrated the object is to simply supply moltenmetal to the joint, in addition to that supplied by the articles undertreatment, for the purpose of reenforcing the joint.

That I claim as my invention, and desire to secure by Letters Patent, is

The herein-described process of electric welding, consisting in feedingmetal to the joint through the welding-arc from a supply carried on thewelding-tool.

CHARLES L. COFFIN.

Witnesses:

ADELAIDE A. ANDERSON, GEO. H. LATHROP.

